NDLI: Detector response function of the NanoPET™/CT system

Content Provider	IEEE Xplore Digital Library
Author	Lantos, J. Czifrus, S. Legrady, D. Cserkaszky, A.
Copyright Year	2010
Description	Author affiliation: Institute of Nuclear Techniques of the Budapest University of Technology and Economics (Lantos, J.; Czifrus, S.; Legrady, D.; Cserkaszky, A.)
Abstract	Even with the huge advance of computers and computing power, full three dimensional reconstructions of PET and CT scans belong to the future as far as commercially available scanners and software are concerned. Recent investigations have shown that with the aid of Graphical Processing Units (GPUs) extremely high computational speed might be achieved, which lends itself to the implementation of iterative 3D reconstruction techniques. Moreover, these techniques make it possible to make use of off-line and on-the-fly Monte Carlo calculations. A consortium of several Hungarian institutions has been working on the development and optimization of a Monte Carlo supported 3D iterative reconstruction program. The in-body scatter processes are modeled by real-time Monte Carlo, however, the detector response is calculated off-line. Therefore, the effective implementation of this MC code requires the calculation of a detector response function in advance. The paper describes our analysis of the response function characteristics of the NanoPET™ (Mediso) detector system. Using MCNPX we constructed a data base consisting of 300 simulations (different incoming photon angles and energies). We studied the sensitivity of the system to several parameters. It was found that the spatial dependence is stronger than the energy dependence. At right angle (at 511 keV) the side-neighbors have an order of magnitude less probability compared to the central pixel, while for photons reaching the central pixel with 350 keV or 511 keV there is only 40% difference in the probabilities. We studied different techniques to include the response function into the MC code mentioned in order to find the optimal strategy. With the approach described in the paper a significant improvement in image quality can be obtained.
Starting Page	3641
Ending Page	3643
File Size	651871
Page Count	3
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874491
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Pixel Photonics Image reconstruction Three dimensional displays Monte Carlo methods Imaging
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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